" (ii) "sin^(2)20^(@)+sin^(2)70^(@)=1

What is sin^(2)20^(@)+sin^(2)70^(@) equal to ?

Find the value of sin^(2)20^(@)+sin^(2)70^(@)

Without using trigonometric tables,evaluate each of the following: (sin^(2)20^(@)+sin^(2)70^(@))/(cos^(2)20^(0)+cos^(2)70^(@))+(sin(90^(@)-theta)sin theta)/(tan theta)+(cos(90^(@)-theta)cos theta)/(cot theta)+cos(40^(0)+theta)-sin(50^(@)-theta)+(cos^(2)40^(0)+cos^(2)50^(@))/(sin^(2)40^(0)+sin^(2)50^(@))

Show that (without using table of trigonometric ratios) :(iv) sin^2 20^@+sin^2 70^@=1

Sin^(2)50^(@)+Sin^(2)70^(@)+Sin^(2)170^(@)=

The value of tan80^(@)tan10^(@)+sin^(2)70^(@)+sin^(2)20^(@) is

sin^(2) 20^(@) + sin^(2) 100^@ + sin^(2) 140^(@) =

(cos 20^(@)+8 sin 70^(@) sin 50^(@) sin 10^(@))/( sin^(2)80^(@)) is equal to

(cos20^(@)+8sin10^(@)sin50^(@)sin70^(@))/(sin^(2)80^(@))=

Find the value of : 3 sin^(2) 20^(@) - 2 tan^(2) 45^(@) + 3 sin^(2) 70^(@) .